68 results about "Metal absorption" patented technology

The present invention discloses an absorber of an ultra wide band of a visible and near-infrared band and a preparation method thereof. The absorber consists of a substrate and five layers of optical thin films, the thin film at the lowest layer being a metal absorption layer, a layer of germanium being above the metal absorption layer, other three layers, which have gradually decreased refractive indexes of materials from bottom up, being above the layer of germanium. The absorber, based on the combination of the incidence resistance effect of the metal absorption layer and a wide band anti-reflection film layer of the layer of germanium, establishes an anti-reflection structure of wide band without transmission, is capable of absorbing ultra wide band of visible and near-infrared band, with high efficiency and insensitive incident angles, and is completely beyond a traditional absorber in performance. Compared with traditional absorbers and artificial electromagnetic absorbers provided in recent years, the absorber provided by the invention employs a compact multi-layer thin film structure which is more simple so as to prevent complicated nanofabrication technology, thereby the absorber provided by the invention is reduced in cost of production, is greatly shorten in the production cycle, and is convenient for large-scale manufacture in batches.

A medium protecting layer is added to the outermost layer of ordinary low-radiation coated glass to serve as an enhanced protecting layer so that the ordinary low-radiation coated glass has high chemical stability, abrasion resistance and oxidation resistance and low friction coefficient and particularly improves scratch resistance, toughened low-radiation coated glass is convenient and simple to transport and process, and the finished product rate of production is greatly improved. In particular, the lowered processing requirements enable more small glass deep-processing enterprises to produce the low-radiation coated glass, and a foundation is established for popularization of environment-friendly energy-saving products. In addition, a metal absorbing layer is first coated on the glass, reflectivity of coated products can be greatly reduced, the problem of light pollution of the toughened low-radiation coated glass with low light transmittance is solved, and the toughened low-radiation coated glass products can meet the requirements of the market at present.

The invention belongs to the field of photoelectric detection and sensing technology, and proposes an infrared detector based on hybrid plasmon resonance enhancement to solve the problems that the preparation cost of the metal absorption-based photodetector in the prior art is high, the light absorption is not high, and the absorption band modulation is difficult. A composite structure of a metalmicro-nano hole array layer / semiconductor film / metal film is used for constructing the infrared detector based on hybrid plasmon resonance enhancemen; local plasmon resonance of the top metal micro-nano hole array, surface plasmons of the bottom layer metal film, and hybrid plasmon resonance formed by coupling the local plasmon resonance and the surface plasmons are extracted to greatly increase the absorption of incident light by the metal; the hot carriers generated by light absorption by the upper and lower layers of metal are injected into the intermediate semiconductor layer so that considerable optical responsivity is obtained; and tunable spectral absorption from near infrared to mid infrared can be achieved by adjusting the period and diameter of the top layer micro-nano holes, andthe thickness and refractive index of the intermediate semiconductor layer.

The invention discloses an electrostatic ion air purifier. The electrostatic ion air purifier comprises a primary filter screen, an electrostatic dust collector, a formaldehyde / benzene filter screen, a uv photocatalyst, an ozone / VOC filter screen and a direct-current fan arranged in sequence, wherein the electrostatic dust collector comprises a frame at the external, and a tungsten wire and a metal absorption plate arranged in the frame; the formaldehyde / benzene filter screen and the ozone / VOC filter screen are both honeycomb composite filter screens; and the uv photocatalyst comprises a photocatalyst filter element and an LED patch ultraviolet lamp. The electrostatic ion air purifier adopts a plasma air purification technology to radically purify the air, to decompose harmful substances in the air, to remove the peculiar smell and to eliminate the smoke, has no poison and harmful substances, and releases out negative ions with high concentration and active oxygen settling dust to soothe the nerves, to remove the fatigue, to improve the sleeping and to achieve the effects of health and environmental protection.

The invention provides a micro-bridge structure of a broadband high-absorption terahertz wave and a fabrication method thereof, which belong to the technical field of imaging of a terahertz detection array at a room temperature and are used for solving the problem of low responsivity under a wide frequency band of a terahertz detector. The micro-bridge structure comprises a metal absorption film at a top layer, a metamaterial pattern at an intermediate layer and a micro electro-mechanical system (MEMS) micro bridge at a bottom layer, wherein silicon nitride dielectric layers are arranged among the metal absorption film, the metamaterial pattern and the MEMS micro bridge in a pairwise manner at intervals; the metal absorption film is an impedance-matching nano-scale metal absorption film; and the metamaterial pattern and the MEMS micro bridge jointly form a metamaterial absorption structure. By the impedance-matching nano-scale metal absorption thin film, the broadband absorption of the terahertz wave can be achieved, and high absorption of the terahertz can be guaranteed through the metamaterial absorption structure jointly formed by the metamaterial pattern and the MEMS micro bridge; the performance for broadband spectrum response and high absorption of the terahertz wave is achieved, and the responsivity of a micro-bridge structurized detection unit to the terahertz wave is comprehensively improved.

The invention pertains to solar energy heat collecting tube field, and discloses a double-layer glass straight through type vacuum heat collecting tube comprising a vacuum bushing composed of an internal glass tube and an external glass tube, and a vacuum layer is provided between the internal glass layer and an external glass tube. A metal absorption tube with a solar energy absorption coating disposed thereon is provided in the vacuum bushing. The metal absorption tube is connected with the vacuum bushing by a gasket. The vacuum bushing provides with two openings at two ends and a corrugated tube thereon. One or two corrugated tubes can be disposed on the external glass tube of the vacuum bushing, and one or two corrugated tubes can also be disposed on the internal glass tube of the vacuum bushing. The disposed corrugated tubes can eliminate expansion quantity difference generated by temperature difference well to prevent tube explosion phenomenon which often happens at the end of the vacuum bushing without the corrugated tube in prior art.

The invention discloses a pressure holding fixture. The pressure holding fixture comprises a plurality of fixture units. The middle portion of the first surface of each fixture unit is provided with a groove used for containing a pressed object. The first surface of each fixture unit serves as a lower fixture surface. The second surface of each fixture unit serves as an upper fixture surface. The upper fixture surface of one fixture unit can be matched with the lower fixture surface of the other fixture unit to complete the pressure holding action. The periphery of each groove is provided with a plurality of first magnetic mechanisms. The second surface of each fixture unit is provided with a plurality of second magnetic mechanisms with the magnetism opposite to the first magnetic mechanisms; or, the second surface of each fixture unit is provided with a plurality of metal absorption mechanisms capable of being attracted by the first magnetic mechanisms. The second magnetic mechanisms are absorbed by the corresponding g first magnetic mechanisms in a matched mode. According to the pressure holding fixture provided by the invention, the obverse sides serve as lower fixture bodies, and the reverse sides serve as upper fixture bodies. The fixture structure is simplified. The mold and fixture cost is saved (originally two fixtures are needed, and now only one fixture is needed.).

Compositions containing a porous organic polymer and a heavy metal chelating moiety are provided for binding heavy metals, for example in remediation and purification. The compositions can be stable and recyclable. The compositions can contain heavy metal chelating moieties such as a thiol, a sulfide, an amine, a pyridine, or a combination thereof. The compositions can bind heavy metals such as lead, cadmium, and mercury. The compositions can have a large surface area greater than about 20 m2 / g. The compositions can be used for remediation and purification to remove heavy metals from a solution. The compositions can have a maximum metal uptake capacity of more than 500 mg g−1 and / or a metal distribution coefficient of at least 1×107 mL g−1 at 1 atm and 296 K. Methods of making the compositions are provided. Methods of binding heavy metals in remediation and purification are also provided.

The invention relates to a vehicle rearview mirror wiper, belonging to the technical field of vehicle parts. A rearview mirror comprises a rearview mirror shell and a mirror, wherein the rearview mirror shell is provided with a shell cavity, a channel is reserved between the upper part of the shell cavity and the upper edge of the mirror, the wiper comprises a wiping sheet, a carbon brush mechanism, a power transmission mechanism, a conductive loop, a first signal collector, a second signal collector and a metal absorption bar, the power transmission mechanism is arranged in the shell cavity, the carbon brush mechanism is connected with the power transmission mechanism and matched with the upper edge of the mirror, the wiping sheet is connected with the carbon brush mechanism and is in contact with the surface of the mirror, at least one magnet is embedded in the wiping sheet, the conductive loop is arranged on the surface of one side of the mirror, the first signal collector is fixed at the upper part of one side of the mirror, the second signal collector is fixed at the upper part of the other side of the mirror, the first signal collector and the second collector correspond to the carbon brush mechanism, the metal absorption bar is fixed on one side of the mirror and corresponds to the magnet. The vehicle rearview mirror wiper can improve the cleaning effect on the mirror, can clean the mirror entirely and has compact structure; in addition, the vehicle rearview mirror wiper can ensure that the carbon brush mechanism carries the wiping part to rest in the required same position.

The invention relates to the technical field of solar flat plate collectors, particularly to an absorbing film of a solar flat plate collector. The absorbing film of the solar flat plate collector adopts the film structure of G / alpha1 M1 beta 1 C alpha2 M2 beta 2 C / A, wherein G refers to a substrate, A refers to air, M1 refers to a metal reflection layer, M2 refers to a metal absorption layer, C refers to medium layers, alpha 1 refers to the thickness of the metal reflection layer M1, alpha 2 refers to the thickness of the metal reflection layer M2, and beta 1 and beta 2 refer to thickness of the medium layers. The film structure enables the solar flat plate collector adopting the absorbing film to have higher spectrum absorptivity under the premise of absorption at the visible region and reflection of near-infrared rays and further have lower emissivity; and the absorbing film improves the heat absorption effect of the solar flat plate collector, greatly reduces the solar flat plate collector through adopting a wider infrared reflection design, and effectively improves the depth of heat absorption.

A solar spectrum selective absorption coating is disclosed. The coating includes, from the substrate to the air interface: substrate 1, infrared reflective layer 2, metal absorption layer 31 with thermal-matching function and semiconductor absorption layer 32 (Ge), and antireflection layer 4 formed by higher refractive index dielectric layer 41 and lower refractive index dielectric layer 42. The coating has superior spectrum selectivity, with a steep transition zone between solar absorption and infrared reflection zones. It has a relatively high absorptance α in the solar spectrum range (0.3-2.5 μm), and a very low absorptance / emissivity ε in the infrared thermal radiation spectrum range (2-50 μm); its a / c ratio is significantly higher than current commercially available products, making it suitable for medium-temperature solar heat collectors using low-power optical concentration. The manufacturing process is simple and does not require complex deposition equipment, so it is suitable for low-cost large-scale production.

The present invention discloses a visible near-infrared ultra-broadband absorber and its preparation method, comprising a substrate and a five-layer optical film, wherein the bottom film is a bottom metal absorbing layer; a top germanium layer is provided on the top of the bottom metal absorbing layer; and remaining three layers are provided on the top of the top germanium layer with gradually decreasing refractive indexes from the bottom to the top. The present invention is based on the blocking effect of the metal absorbing layer and broadband anti-reflection film stack of the germanium layer, which has realized visible near-infrared ultra-broadband absorption with high efficiency and good angle insensitivity, and has fully surpassed traditional absorbers in terms of performances. Compared with conventional broadband absorbers and artificial electromagnetic absorbers proposed in recent years, the compact multilayer film structure in the present invention is simpler and avoides complicated nano-fabrication techniques. Therefore, it can significantly reduce production cost and shorten the production cycle, and is thus suitable for large-scale mass production.

The application discloses cooperative medicament level sodium alginate and alginate-originated oligosaccharide technological method, wherein the provided steps include taking dry sodium alginate and leaching, digesting, diluting, foaming, floating, and primary fine filtrating, and resulting in clear solution C, exploiting soda solution and regulating pH, adding activated charcoal in the clear solution C and tarnishing through absorption, then fine filtrating two stage through a closed frame filter and paper board filter, conducting weight metal absorption of the filtrating solution through ion exchange resin, and resulting in clear solution F, acidifying, dewatering, rinsing the clear solution F, partially degrading and decomposing by adding lyase, centrifugally separating undissolved acid block, solid neutralizing to result in medicament level sodium alginate, mist spray drying the filtration solution and resulting in alginate-originated oligosaccharide. The composite yield of the two types of products is high, the weight metal content of sodium alginate is low, the endotoxin is low, the weight metal content of alginate-originated oligosaccharide is low, the cooperative medicament level sodium alginate and alginate-originated oligosaccharide technological method satisfies applications in cosmetic industry.

The invention provides a manufacturing method of a polycrystalline silicon film material, which is characterized by comprising the following steps of: 1. selecting a substrate, and forming a first blocking layer on the substrate; 2. sequentially forming a metal induced layer, a second blocking layer and an amorphous silicon layer on the first blocking layer; 3. carrying out primary annealing processing on a product obtained in step 2 to obtain a partially crystallized film; 4. forming a metal absorption layer on the partially crystallized film; 5. carrying out secondary annealing processing on the product obtained in step 2; and 6. removing the metal absorption layer after the secondary annealing processing. In the invention, the metal induced layer is formed before amorphous silicon and positioned between the two blocking layers, and because slot type structures are carved on the prepared blocking layers and have inconsistent and quite small distances with the amorphous silicon layer, the invention performs key actions on shortening the heat processing time, increasing the grain size and controlling and inducing metals to diffuse towards the amorphous silicon layer.

The invention belongs to the technical field of remediation of heavy metal contaminated soil, and particularly relates to a soil smoldering technology for treatment and remediation of heavy metal co-contaminated soil. The soil smoldering remediation method mainly comprises the following steps: plant straws are covered with soil to form a covered body; the outer layer is a soil layer, and the straws or a mixture of straws and soil are arranged inside; the inside is kept in an anaerobic condition, and the soil smoldering treatment is then carried out. Through solidification, absorption, chelation, complexation and other various reactions, the heavy metal co-contaminated soil treated by applying the technology provided by the invention achieves a reduced proportion of chemical forms which can easily migrate and diffuse to the environment, and an increased proportion of chemical forms which are difficult to release to the environment. Therefore, environmental and ecological risks from heave metals are reduced. The technology provided by the invention can simultaneously fix multiple heave metals, reduce the heave metal absorption and accumulation by plants, effectively kill various pathogenic bacteria in soil and increase the biomass of crops, and is a simple, high-efficient, easy-to-operate and low-cost in-situ remediation technology for heavy metal co-contaminated soil.

The invention relates to the technical field of photoelectric detection, in particular to a thermoelectron photoelectric detector based on chiral metal absorption. The thermoelectron photoelectric detector is of a multilayer structure and sequentially comprises a substrate layer, a lower metal layer, a middle semiconductor layer and an upper metal layer from bottom to top, wherein the lower metal layer and the upper metal layer are connected through a wire. According to the thermoelectron photoelectric detector based on chiral metal absorption, different Schottky barriers caused by a left-handed hole structure and a right-handed hole structure are utilized, so that the net absorptivity of the upper metal layer and the lower metal layer is enhanced through asymmetric absorption, thereby finally improving the absorption of incident light by the detector, and facilitating the detection of the incident light. In addition, the right-handed hole structure of the upper metal layer is filled with vanadium dioxide, the temperature of the environment where the detector is located is changed, and the regulation and control over the detection wavelength can be achieved. The thermoelectron photoelectric detector is simple in structure, is easy to prepare, is very good in application prospect, and provides a new idea for the research of a detector.

The invention relates to a DGT (diffusive gradients in thin films) technology suitable for extraction of unsaturated active-state soil elements. Equipment for the technology comprises a sampler, a round base, a diffusion support network and a sealing cover, wherein the cylindrical diffusion support network is coaxially and fixedly mounted on the round base; the sealing cover is coaxially embeddedinto the upper part of the diffusion support network in a sealed manner; a diffusion film is coaxially applied to the inner edge of the diffusion support network; a pressure valve plate is coaxially mounted on the inner edge of the diffusion film of the diffusion support network in a sliding manner; a compression spring is mounted between the pressure valve plate and the sealing cover; the diffusion film between the pressure valve plate and the base is filled with heavy metal absorbing gel. According to the DGT, two gradients including inorganic element and water can be provided, so that heavymetal in upland soil can be adsorbed in site, accuracy of a detection result is greatly improved, monitoring cost is reduced, and the defect that original DGT cannot be used under the water shortagecondition is overcome.

The invention provides an energy absorber comprising a dielectric optical waveguide which is used for transmitting photons; and a metal wrapping layer which comprises a metal absorption structure in which the metal layer completely wraps the dielectric optical waveguide.

The invention provides a method for preparing a polycrystalline silicon thin film. The method comprises the following steps of: depositing a barrier layer on a glass substrate and depositing an amorphous silicon thin film; forming a covering layer on the amorphous silicon thin film and etching an induction hole on the covering layer; forming a metal induction thin film on the covering layer to enable the metal thin film to contact the amorphous silicon thin film at the induction hole; annealing for the first time to obtain a polycrystalline silicon island from the amorphous silicon thin film below the induction hole; depositing a metal absorption layer on the metal induction thin film, and annealing for the second time to form a crystallization thin film with uniformly distributed crystal grains; and removing the metal absorption layer and the covering layer.

Provided is a composition for accelerating absorption of metals, comprising a metal-acidic amino acid chelate as an active ingredient. The composition of the present invention has therapeutic effects on prevention and treatment of various diseases arising from a deficiency or shortage of metals, by utilization of a metal-acidic amino acid chelate that exhibits excellent effects of improving delivery and absorption of a drug into target organs, such that pharmaceutical effects of individual metals can be exerted. In particular, a pharmaceutical composition comprising a zinc-aspartate chelate increasing an intraprostatic zinc content as an active ingredient is highly effective for prevention and treatment of prostate and testicular diseases.

The invention relates to a method for disproportionation and transalkylation of toluene heavy aromatics and mainly solves the problems that aromatic ring loss rate is high, reaction hydrogen consumption is high and the like during reaction in the prior art. Catalyst used in the method includes: (a) at least one of platinum or palladium metals; and (b) at least one of ZSM-12, mordenite and zeolite. The catalyst is preprocessed in a way that the catalyst is contacted with sulfur compounds at 200-600 DEG C to allow sulfur content of the catalyst to be not larger than metal absorption saturation value. The problems that aromatic ring loss rate is high, reaction hydrogen consumption is high and the like are solved. The method is applicable to industrial production of disproportionation and transalkylation of toluene heavy aromatics.

The invention discloses a visible-infrared broadband absorber and a preparation method thereof. The absorber comprises a substrate; a polystyrene pellet single-layer film layer and an alternating filmlayer formed by mutual alternating of metal absorption layers and non-metal dielectric layers are arranged successively on the substrate from top to bottom; a metal dielectric layer approaches the bottom polystyrene pellet single-layer film layer; each metal absorption layer is formed by one or more metal absorbing layer units; and each non-metal dielectric layer is formed by one or more metal absorbing layer units. The absorber has advantages of high absorption efficiency, wide working band, simple process, low cost and large area preparation and the like. Compared with the traditional broadband absorber, the absorber having a compact multi-layer film structure has the following beneficial effects: the production cost is lowered obviously; the production cycle is shortened substantially;and large-scale batched production can be realized.

The invention discloses a method for reducing heavy metal absorption of crop foliage. Clear water is sprayed on foliage of a target plant to clean the foliage, the ground surface is paved with thin film, and after water on the foliage is completely volatilized, a foliage fertilizer is sprayed on the foliage immediately; the agent is sprayed once every 7-15 days in rainless weather, and the foliage heavy metal absorption rate can be decreased by 60%-95%. The method can effectively reduce the foliage absorption effect to heavy metal ions, and the safety risk of agricultural products can be significantly reduced; absorption of plant foliage to the heavy metal can be effectively reduced, and the foliage heavy metal absorption efficiency can be decreased by 60%-95%; the foliage fertilizer can be jointly applied with foliage fertilizer, and the labor cost is reduced; no waste is produced, and secondary pollution to the environment cannot be caused basically; the method has the advantages of being simple, easy to operate, rapid, effective, low in input cost and the like; the plant foliage can be effectively prevented from heavy metal damage, and the method has an important value to safety production of the agricultural products.

The invention discloses an integrally-designed CPT (Coherent Population Trapping) atomic frequency scale physical system which comprises an assembly laser tube (1), an optical assembly, an absorption cell (7), a hot ring (5) and a C-field coil (8), an optoelectroulc module and a heating thermostat, wherein a laser tube sleeve (2) is rotatably assembled in an assembling hole of the hot ring (5), the laser tube (1) and the optical assembly behind the laser tube are fixed in a step assembling hole of the hot ring (5) through the laser tube sleeve (2), the C-field coil (8) directly wound on the absorption cell (7) and the absorption cell (7) are assembled on a metal absorption cell sleeve (9) with a magnetic permeability of more than 2000, and the absorption cell sleeve (9) is coaxially coupled and connected to the back of the optical assembly through the assembling hole of the non-magnetic conductor hot ring (5). Through the integrated design, the laser tube and the absorption cell are subjected to temperature control simultaneously, thus the defect of the design that the laser tube and the absorption cell are divided into two parts and respectively subjected to the temperature control in the prior art is eliminated, the volume of the physical system and the power consumption of the physical system are reduced.

The invention relates to the field of micro-nano photoelectron and laser technologies and photoelectron integration and provides an electric injection surface plasma micro-nano structure waveguide output laser source of a coplanar electrode, wherein the laser source is suitable for on-chip integration. The laser source comprises a semiconductor active layer, an insulating medium layer and a metal film layer. The metal film layer and the semiconductor active layer are spaced by the insulating medium layer, a metal strip-shaped waveguide is formed on the metal film layer, a semiconductor strip-shaped waveguide and two carrier injection areas are manufactured on the semiconductor active layer, the metal strip-shaped waveguide and the semiconductor strip-shaped waveguide are perpendicular to each other, and surface plasma sub-wavelength cavities are formed in the MIS structure in the intersection position. The two carrier injection areas are located over the metal strip-shaped waveguide and serve as one part of the sub-wavelength cavities. Transverse electric injection is achieved on the semiconductor active layer to perform pumping. According to the laser source, metal absorption loss is counteracted through semiconductor high-gain material to achieve excitation and emission of light in microcavities, and finally the light is coupled to enter the semiconductor waveguide to be output.

[Object] Provided are a laminate film and an electrode substrate film with excellent etching quality, in which a circuit pattern formed by etching processing is less visible under highly bright illumination, and a method of manufacturing the same.[Solving Means] A laminate film includes a transparent substrate 60 formed of a resin film and a layered film provided on at least one surface of the transparent substrate. The layered film includes metal absorption layers 61 and 63 as a first layer and metal layers (62, 65), (64, 66) as a second layer, counted from the transparent substrate side. The metal absorption layers are formed by a reactive sputtering method which uses a metal target made of Ni alone or an alloy containing two or more elements selected from Ni, Ti, Al, V, W, Ta, Si, Cr, Ag, Mo, and Cu, and a reactive gas containing oxygen. The reactive gas contains hydrogen.

The invention discloses a waste electrical appliance spiral crusher which comprises a shell. A feeding opening is formed in one side of the outer surface of the shell, a protection cover is installedon the upper surface of the shell, a radiator is installed on the upper surface of a first stepping motor, an air cylinder is installed on one side of the protection cover, an extrusion plate is installed below a supporting rod, a foam damping mat is installed below a crushing platform, a magnetic adsorption block is installed inside a metal absorption bin, an axial channel is arranged on one sideof a metal separating bin, a rotating blade is installed below a guide plate, an activated carbon adsorption layer is installed below the rotating blade, and a spring damper is installed at the bottom of the shell. The waste electrical appliance spiral crusher is provided with the magnetic adsorption block, the rotating blade, a crushing drill bit and the activated carbon adsorption layer, and therefore the problem that an existing waste electrical appliance spiral crusher is poor in crushing effect and easily causes environmental pollution is solved.

The invention relates to the technical field of grinding machine pushing and discharging devices, and discloses a device for pushing and discharging materials at the discharge port of an automatic grinder, which includes an outer body, the upper surface of the outer body is fixedly connected with a discharge port, and the discharge port of the The upper surface is fixedly connected with a lower hopper, and the upper surface of the outer body near the discharge port is fixed with a first hydraulic cylinder. The side of the first hydraulic cylinder close to the discharge port is fixedly connected with a telescopic tube, and the telescopic tube is far away from the first hydraulic cylinder. One side of the automatic grinder is fixedly connected with a telescopic plate, and the automatic grinding machine’s discharge port pushes and discharges the device. Through the first hydraulic cylinder, telescopic tube, telescopic plate and the setting of the trough, the first hydraulic cylinder controls the telescopic tube to drive the telescopic plate. Stretching, so as to effectively control the speed of blanking, through the blanking trough to make the blanking more uniform, through the setting of metal absorbing rods and strong magnets, while the waste is pushed out, the strong magnets are used to remove the recyclable waste from the waste Metal adsorption achieves the effect of waste classification and recycling.

The invention relates to Group 1 metal / silica gel compositions comprising silica gel and an alkali metal or an alkali metal alloy. The compositions of the inventions are described as Stage 0, I, II, and III materials. These materials differ in their preparation and chemical reactivity. Each successive stage may be prepared directly using the methods described below or from an earlier stage material. Stage 0 materials may, for example, be prepared using liquid alloys of Na and K which are rapidly absorbed by silica gel (porous Si02) under isothermal conditions, preferably at or just above room temperature, to form loose black powders that retain much of the reducing ability of the parent metals. When the low melting Group 1 metals are absorbed into the silica gel, a mild exothermic reaction produces Stage I material, loose black powders that are indefinitely stable in dry air. Subsequent heating to 400 DEG C produces Stage II materials, which are also loose black powders. Further heating above 400 DEG C forms Stage III material with release of some Group 1 metal. It is believed that Stage I, II and III materials represent reductions of the silica gel after absorption of the Group 1 metal. Preferred Group 1 metal / silica gel compositions of the invention are those containing sodium, potassium, or sodium-potassium alloys with sodium and sodium- potassium alloys being most preferred. Each stage of the Group 1 metal / silica gel composition of the invention may be used as a reducing agent reacting with a number of reducible organic materials in the same manner known for alkali metals and their alloys.

The invention relates to production equipment for preparing recycled building materials from building wastes. The production equipment comprises a hopper, the bottom of which is provided with a conveyor. A metal absorption device is arranged at one side of the hopper. A first-stage screening machine is disposed at one side of the conveyor. A second-stage screening machine is arranged at one side of the first-stage screening machine. A pulverizer is arranged below the first-stage screening machine. A coarse material cleaning tank is arranged below the second-stage screening machine. A crusher is arranged at one side of the second-stage screening machine. A spraying device is arranged between the second-stage screening machine and the crusher. A fine material collecting tank is arranged below the pulverizer. A material storage tank is disposed at one side of the fine material collecting tank. A brick making machine is disposed below the fine material collecting tank. A coarse material collecting tank is arranged below the coarse material cleaning tank. Building wastes are fully utilized. Through graded screening, wastes are classified and can be made into bricks or stone crushed aggregates according to needs. Stone crushed aggregates with proper particle size can be used as concrete materials. By the production equipment, the environment will not be polluted.